Keith Hackett’s verdict

1) Stop the game: the ball has to be in the quadrant, or at least overlapping the quadrant’s line. So first have the groundstaff sweep the water away until the ball can be positioned to your satisfaction for a proper corner. If that doesn’t work, suspend the game to allow time for staff to work on the corner area with forks and sand. If that proves impossible, you’ll have to abandon. Thanks to Keith Walker.

2) Swallow your pride, admit your mistake and withdraw the red card. Apologise to the player - but also tell him that you will not tolerate any further confrontational behaviour. To avoid this sort of error, referees are always instructed to take names when they are issuing cautions. Dr Stan Kull wins the shirt.

3) Tell them to grow up, and if the physical confrontation warrants it, issue cautions. Then play it by the book: tell them it’s your responsibility to take the match ball off the field of play at the end of the game, after which you will hand it over to home officials. What the home club does with it after that is down to them. Thanks to Ryszard Kaleta.